Numerical Simulation Of Atmospheric Radiative Transmission And Experimental Study On The Radiative Properties Of Aerosol Particles

Atmospheric radiative transfer is the transport and transformation of solar radiation and thermal radiation in the form of electromagnetic wave, which is the main driving force of atmospheric sources of physical activity. The influence of human activities on the global climate system and the development of atmospheric remote sensing, atmospheric chemistry, meteorology and other disciplines, is making the study of atmospheric radiative transfer more and more important.The most fundamental problem faced by Calculation of atmospheric radiation is that the absorption of atmospheric gases and absorption and scattering of cloud and aerosol particles coexist. Therefore, the atmospheric gas absorption coefficients, the quantification of clouds and aerosol particle scattering and absorption properties, solving the radiative transfer equation become a priority in the study of atmospheric radiative transfer.In this paper, aerosol particles under different weather was collected by aerosol collector, and complex refractive index of aerosol particles was got through transmission experiment method and inverse model. For common aerosol particles (SiO₂ particles, Al₂O₃ particles) and their mixed particles, optical constants was obtained by the same method and compared with the data by VARI model of the effective medium theory. The refractive index of Al₂O₃ by this experimental is close to Malitson's. The real part of complex refractive index by experimental inversion agreed well with that by VARI model. Besides, the absorption coefficient of the atmosphere can be calculated by standard K distribution pattern. Spherical harmonic discrete ordinate method was chosen to solve the calculation of radiative transfer equation. The results in the absence of standard atmospheric aerosol cloud-free case was compared with LOWTRAN,getting transmittance with the average error of 0.0698. For typical clouds, atmospheric radiative transfer simulation was used to analyse the affect of the clouds optical properties on atmospheric radiation, and details of description on how to use SHDOM package was given.